Jean-Claude Bunzli - Benzothiazole- and Benzoxazole-Substituted Pyridine-2-Carboxylates as Efficient Sensitizers of Europium Luminescence

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  Shavaleev,N.M., Scopelliti,R., Gumy,F., Bunzli,J.C.G.   Inorganic Chemistry 2009 48  (13) 6178-6191

  Abstract: Facile synthesis of benzothiazole- and   benzoxazole-substituted pyridine-2-carboxylic acids has been   developed. these ligands form mononuclear nine-coordinate   complexes n(kappa(3)-ligand)(2)(kappa(1)-ligand)(H(2)O)(2) with   light and heavy trivalent lanthanides, as established from the   X-ray analysis of 11 complexes. crystal structure of a minor   product, the anhydrous nine-coordinate complex u(kappa(3)-)(3),   has also been determined. Photophysical studies of gadolinium   chelates indicate that the triplet states of the new ligands are   located at 20400-21400 cm(-1). he ligands are good sensitizers of   the europium luminescence with ligand-to-metal energy transfer   efficiency in the range 60-100%. The overall uantum yields of the   europium emission are substantial, 12-14% in the solid state, and   increase to 29-39% upon replacement of two metal-coordinated   water molecules with dimethylsulfoxide in solution. he   luminescence of near-infrared emitting lanthanides is also   sensitized, but uantum yields are much smaller, reaching 0.17 for   neodymium and 1.25 for ytterbium in SO, while energy transfer   efficiencies for these two ions are below 50

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